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of course<-->on duty
on (the, an) average
平均，按平均数计算
Each household sold, on the average, two pigs.
平均每户交售了两口生猪。
On the average, there are 300 tourists a week.
每星期平均有300游客。
We received 20 calls a day on average.
我们平均每天接到二十通电话。
He smokes ten cigarettes a day on an average.
他平均一天抽十根烟。
On an average, there are 20 boys present every day.
每天平均有20个男生出席。
On average we receive five letters each day.
我们平均每天收到五封信。
We fail one student per year on average.
我们平均每年有一个学生不及格。
of course<-->on duty
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